Electrical Engineering 101 by Darren Ashby & Darren Ashby

Author:Darren Ashby & Darren Ashby [Ashby, Darren]
Language: eng
Format: azw3
ISBN: 9780123860019
Publisher: Elsevier Science
Published: 2011-10-13T00:00:00+00:00

Voltage Sources

What would cause a voltage source not to maintain the voltage output? Let me give you a hint: When put under load, a voltage source will heat up. So what creates heat? You got it: resistance. A voltage source has an internal resistance. A battery is a good example—see Figure 4.9.

Figure 4.9 The Dura-gizer; now that is one tough battery!

As current is applied to the load, the voltage drop occurs across this internal resistance, just like the voltage divider rule says it will. This resistor inside heats up just like one on the outside does, making the voltage source warm. If the source doesn't compensate for it, you will see less voltage at the output.

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